Fogging of the automatic transmission pan (automatic gearbox) may indicate a slight leak of transmission fluid due to the following reasons:
* Damage to the pan gasket: Worn, cracked, or deformed gasket between the pan and the transmission housing can cause fluid to leak.
* Loose pan bolts: The bolts that secure the pan to the body can become loose over time, causing minor leakage.
*Transmission Fluid Overflow: If the transmission is overfilled with fluid, excess fluid may come out of the pan.
* Driveshaft Leak: In rare cases, fluid may leak through the rear or front driveshaft seal.
* Faulty Oil Pump: A faulty oil pump can create excessive pressure in the system, causing fluid to leak from weak spots such as the pan.
Most cases of automatic transmission pan fogging are not serious and do not require immediate repair. However, it is necessary to monitor the transmission fluid level and correct leaks promptly to prevent further damage or malfunction.